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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: LineInputParser.html 5 2014-12-10 22:27:01Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.msrp.msg;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.ByteArrayOutputStream;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>/**<a name="line.12"></a>
<span class="sourceLineNo">013</span> * Parses CRLF-terminated lines.<a name="line.13"></a>
<span class="sourceLineNo">014</span> */<a name="line.14"></a>
<span class="sourceLineNo">015</span>public class LineInputParser {<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>    private final int maxLength;<a name="line.17"></a>
<span class="sourceLineNo">018</span>    private final ByteArrayOutputStream buf = new ByteArrayOutputStream();<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>    private boolean pendingCR;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>    /**<a name="line.22"></a>
<span class="sourceLineNo">023</span>     * Constructor.<a name="line.23"></a>
<span class="sourceLineNo">024</span>     *<a name="line.24"></a>
<span class="sourceLineNo">025</span>     * @param maxLength maximum allowed line length in bytes<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * @throws IllegalArgumentException if {@code maxLength} negative<a name="line.26"></a>
<span class="sourceLineNo">027</span>     */<a name="line.27"></a>
<span class="sourceLineNo">028</span>    public LineInputParser(int maxLength) {<a name="line.28"></a>
<span class="sourceLineNo">029</span>        if (maxLength &lt; 0)<a name="line.29"></a>
<span class="sourceLineNo">030</span>            throw new IllegalArgumentException("maxLength &lt; 0");<a name="line.30"></a>
<span class="sourceLineNo">031</span>        this.maxLength = maxLength;<a name="line.31"></a>
<span class="sourceLineNo">032</span>    }<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>    /**<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * Input the next byte.<a name="line.35"></a>
<span class="sourceLineNo">036</span>     *<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * @param b input byte<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * @return complete line (not including CRLF), or null if more bytes are needed<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @throws ProtocolException if the line exceeds the maximum allowed length<a name="line.39"></a>
<span class="sourceLineNo">040</span>     */<a name="line.40"></a>
<span class="sourceLineNo">041</span>    public String inputLineByte(byte b) throws ProtocolException {<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>        // Update state machine<a name="line.43"></a>
<span class="sourceLineNo">044</span>        if (this.pendingCR) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>            if (b == '\n') {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                final String line = new String(this.buf.toByteArray(), Util.UTF8);<a name="line.46"></a>
<span class="sourceLineNo">047</span>                this.reset();<a name="line.47"></a>
<span class="sourceLineNo">048</span>                return line;<a name="line.48"></a>
<span class="sourceLineNo">049</span>            }<a name="line.49"></a>
<span class="sourceLineNo">050</span>            buf.write('\r');            // flush the pending CR<a name="line.50"></a>
<span class="sourceLineNo">051</span>        }<a name="line.51"></a>
<span class="sourceLineNo">052</span>        this.pendingCR = b == '\r';<a name="line.52"></a>
<span class="sourceLineNo">053</span>        if (!this.pendingCR)<a name="line.53"></a>
<span class="sourceLineNo">054</span>            buf.write(b);<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>        // Check max length<a name="line.56"></a>
<span class="sourceLineNo">057</span>        if (buf.size() &gt;= this.maxLength) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>            final String prefix = new String(buf.toByteArray(), 0, Util.TRUNCATE_LENGTH, Util.UTF8);<a name="line.58"></a>
<span class="sourceLineNo">059</span>            throw new ProtocolException("message line starting with " + Util.quotrunc(prefix)<a name="line.59"></a>
<span class="sourceLineNo">060</span>              + " is too long (longer than " + this.maxLength + " bytes)");<a name="line.60"></a>
<span class="sourceLineNo">061</span>        }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>        // Done<a name="line.63"></a>
<span class="sourceLineNo">064</span>        return null;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Determine whether this instance is sitting at a line boundary.<a name="line.68"></a>
<span class="sourceLineNo">069</span>     *<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * &lt;p&gt;<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * This will be true after initial construction, invocation of {@link #reset},<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * or an invocation {@link #inputLineByte inputLineByte()} that returned a non-null value.<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * &lt;/p&gt;<a name="line.73"></a>
<span class="sourceLineNo">074</span>     */<a name="line.74"></a>
<span class="sourceLineNo">075</span>    public boolean isBetweenLines() {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        return this.buf.size() == 0 &amp;&amp; !this.pendingCR;<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    /**<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * Reset parse state.<a name="line.80"></a>
<span class="sourceLineNo">081</span>     */<a name="line.81"></a>
<span class="sourceLineNo">082</span>    public void reset() {<a name="line.82"></a>
<span class="sourceLineNo">083</span>        this.buf.reset();<a name="line.83"></a>
<span class="sourceLineNo">084</span>        this.pendingCR = false;<a name="line.84"></a>
<span class="sourceLineNo">085</span>    }<a name="line.85"></a>
<span class="sourceLineNo">086</span>}<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>




























































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